Division of Preventive and Behavioral Medicine, Department of Medicine, University of Massachusetts Medical School, Worcester, MA, USA.
BMC Med Res Methodol. 2009 Dec 30;9:87. doi: 10.1186/1471-2288-9-87.
The current food pyramid guidelines have been criticized because of their complexity and the knowledge required for users to understand the recommendations. Simplification of a dietary message to focus on a single key aspect of dietary quality, e.g., fiber intake, may make the message much easier to comprehend and adhere, such that respondents can achieve greater weight loss, better dietary quality and overall metabolic health.
This is a randomized controlled clinical trial with two equal sized arms. In total, 240 obese adults who meet diagnostic criteria for the metabolic syndrome will be randomized to one of the two conditions: 1) a high fiber diet and 2) the American Heart Association (AHA) diet. In the high fiber diet condition, patients will be given instruction only on achieving daily dietary fiber intake of 30 g or more. In the AHA diet condition, patients will be instructed to make the several dietary changes recommended by the AHA 2006 guidelines. The trial examines participant weight loss and dietary quality as well as changes in components of the metabolic syndrome, inflammatory biomarkers, low-density lipoprotein cholesterol levels, insulin levels, and glycosolated hemoglobin. Potential mediators, i.e., diet adherence and perceived ease of the diet, and the intervention effect on weight change will also be examined.
The purpose of this paper is to outline the study design and methods for testing the simple message of increasing dietary fiber. If the simple dietary approach is found efficacious for weight loss; and, improves dietary quality, metabolic health, and adherence, it might then be used to develop a simple public health message.
NCT00911885.
现行的食物金字塔指南因复杂且需要用户理解建议的知识而受到批评。将饮食信息简化为专注于饮食质量的单一关键方面，例如纤维摄入量，可以使信息更容易理解和遵循，从而使受访者能够实现更大的体重减轻、更好的饮食质量和整体代谢健康。
这是一项随机对照临床试验，分为两个相等大小的组。总共将有 240 名符合代谢综合征诊断标准的肥胖成年人被随机分配到以下两种情况之一：1）高纤维饮食；2）美国心脏协会（AHA）饮食。在高纤维饮食组中，仅对患者进行每日膳食纤维摄入量达到 30 克或更多的指导。在 AHA 饮食组中，将指导患者按照 2006 年 AHA 指南推荐的几种饮食改变进行饮食。该试验检查参与者的体重减轻和饮食质量，以及代谢综合征成分、炎症生物标志物、低密度脂蛋白胆固醇水平、胰岛素水平和糖化血红蛋白的变化。还将检查潜在的中介因素，即饮食依从性和对饮食的易感性，以及干预对体重变化的影响。
本文旨在概述测试增加膳食纤维这一简单信息的研究设计和方法。如果简单的饮食方法被发现对减肥有效，并且改善了饮食质量、代谢健康和依从性，那么它可能被用于开发一个简单的公共卫生信息。
NCT00911885。
